JBD BMS Help

[mystic pizza]

First post.

I am trying to determine which BMS I need for my Lifep04 bank. I think I want the 120A version , but am not sure what the difference is between these two. Can anyone offer any advice which would be better.

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I think I want a common port BMS with low temperature disconnect.

Thank you

 

[mystic pizza]

No replies.


They look different physical sizes
one of them has cables attached, the other has what looks like threaded attachments
One of them has no current specifications
They both look like JBD Bms.


Maybe I need to ask JBD.

 

[mikefitz]

Try this, if you pay for express shipping delivery is within 10 days, select the option 4S 120A lifepo4 with UART

4S or 3S 12V Li ion or Lifepo4 Battery smart BMS with Bluetooth function UART and RS485 communication with 60A to 120A constant current – LLT POWER ELECTRONIC

If you are in the usa,

4s BMS 120a LifePo4 with M6 Threaded Terminals

Comes with M6 Threaded Terminals soldered to the board as shown. BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries 120 amp continuous charge or discharge current Low Temperature Chargin…

overkillsolar.com

The Overkill unit has additional options and excellent support.

Mike

 

[MrNatural22]

Maybe chat with Dexter @HighTechLab He maybe could give you some sound advise on this and may soon be stocking these JBD BMSs.

 

[Diysolar123]

First post.

I am trying to determine which BMS I need for my Lifep04 bank. I think I want the 120A version , but am not sure what the difference is between these two. Can anyone offer any advice which would be better.

a few quick thoughts...

1) do NOT plan on using more that 60-75% of the rated capacity of your BMS at most...
2)make sure to get a serial port interface so you can ask the stupid thing what it is doing when it acts up hehe
3)if the serial port has an open interface spec that is a big plus vs a secret custom app that will only work on your phone if you turn on location services **boggle**
4)low temp disconnect is good...if you will ever get low temps hehe
5)common and seperate port decision can be driven by how your mppt/charge controller would react if(or when) your BMS decides to disconnect for some mystery reason (see item #2)
6) BMS balance is useless...I just always turn it off now and spend the $35 on an active balancer that actually works.

 

[HighTechLab]

My advice is probably going to be taken as a grain of salt, as it should...but I never trust the details in advertisements on Alibaba/Aliexpress. I always get into contact directly with the vendor to confirm all the details before purchasing, then I typically only use Alibaba to handle the payment portion.

Most of the times you find listings from counterfeit or trading companies, which these listings are from a trading company, not the manufacturer. These BMS units are originally manufactured by Jaibaida, or JBD for short. If the company you are buying from is NOT Dongguan Jia Bai Da Electronic Technology Co., Ltd. then you are dealing with a trading company, not the manufacturer. Also do note that JBD only has one sales person that speaks English.

Best way to communicate to vendors is almost always through WeChat, but if you don't have WeChat already, I wish you luck because to create an account requires having a friend that has already had wechat for 6 months to verify you, and your friend can only verify 1 person per month.

I'm with @mikefitz on this one, overkill solar is the way to go if you are in the USA, but since we don't know and can't assume your location, it may not be an option. @MrNatural22 said that I will be stocking these soon, and that is true, I will be, but as of today, it will be at 14 days for manufacturing and at least another 14 days for shipping by air, at which point your order with OverkillSolar would likely have already been fulfilled.

The other catch about buying on Ali is that sometimes you get hit with an import duty along the way, which can come as a surprise and is no fun.

I've gotten hit with a surprise 22% duty on a $8.6k purchase before back when I was buying CALB CA180 cells. Trust me, I wised up quickly.

 

[mystic pizza]

Wow, thanks for all the advice guys.What a great forum.

 

[mystic pizza]

Try this, if you pay for express shipping delivery is within 10 days, select the option 4S 120A lifepo4 with UART

4S or 3S 12V Li ion or Lifepo4 Battery smart BMS with Bluetooth function UART and RS485 communication with 60A to 120A constant current – LLT POWER ELECTRONIC

If you are in the usa,

4s BMS 120a LifePo4 with M6 Threaded Terminals

Comes with M6 Threaded Terminals soldered to the board as shown. BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries 120 amp continuous charge or discharge current Low Temperature Chargin…

overkillsolar.com

The Overkill unit has additional options and excellent support.

Mike

Thanks Mike, I do like the overkill solution, which I assume is a re badged JBD with some bells and whistles added. I am in the UK, so although it looks like a great option, is more expensive than the direct from China route.

 

[mystic pizza]

a few quick thoughts...

1) do NOT plan on using more that 60-75% of the rated capacity of your BMS at most...
2)make sure to get a serial port interface so you can ask the stupid thing what it is doing when it acts up hehe
3)if the serial port has an open interface spec that is a big plus vs a secret custom app that will only work on your phone if you turn on location services **boggle**
4)low temp disconnect is good...if you will ever get low temps hehe
5)common and seperate port decision can be driven by how your mppt/charge controller would react if(or when) your BMS decides to disconnect for some mystery reason (see item #2)
6) BMS balance is useless...I just always turn it off now and spend the $35 on an active balancer that actually works.

1. Good point thanks. So approx 70 A of a 120A BMS. That should suit me fine, though I notice they have a 150 A version too,
2. Is the serial port UART/485 offering on the above BMS?
3. ?
4. I live in the UK, where it often falls below zero degrees C, so probably a good option to include low temp disconnect
5. Ah, now I hadn't even considered this. I have an Outback Flexmax 30 MPPT, which is a rebadged tracer BN series controller. I have no idea what happens if it is disconnected. I assume you mean from the battery.
6.Noted.

Many thanks

 

[mystic pizza]

My advice is probably going to be taken as a grain of salt, as it should...but I never trust the details in advertisements on Alibaba/Aliexpress. I always get into contact directly with the vendor to confirm all the details before purchasing, then I typically only use Alibaba to handle the payment portion.

Most of the times you find listings from counterfeit or trading companies, which these listings are from a trading company, not the manufacturer. These BMS units are originally manufactured by Jaibaida, or JBD for short. If the company you are buying from is NOT Dongguan Jia Bai Da Electronic Technology Co., Ltd. then you are dealing with a trading company, not the manufacturer. Also do note that JBD only has one sales person that speaks English.

Best way to communicate to vendors is almost always through WeChat, but if you don't have WeChat already, I wish you luck because to create an account requires having a friend that has already had wechat for 6 months to verify you, and your friend can only verify 1 person per month.

I'm with @mikefitz on this one, overkill solar is the way to go if you are in the USA, but since we don't know and can't assume your location, it may not be an option. @MrNatural22 said that I will be stocking these soon, and that is true, I will be, but as of today, it will be at 14 days for manufacturing and at least another 14 days for shipping by air, at which point your order with OverkillSolar would likely have already been fulfilled.

The other catch about buying on Ali is that sometimes you get hit with an import duty along the way, which can come as a surprise and is no fun.

I've gotten hit with a surprise 22% duty on a $8.6k purchase before back when I was buying CALB CA180 cells. Trust me, I wised up quickly.

SO, if I risk the Aliexpress route, which I must admit I have never used before, I would be better buying direct from JBD, that makes sense, though they seem to hold less stock than the other vendors.

I don't have wechat, and it sounds unlikely I can get a recommendation, but thanks for the tip.

I am in the UK, otherwise the overkill option, or your own (I assume you are in the US) would be the way to go.

Maybe I should just source a Daly unit already in the uk.

Thanks for your input

 

[mystic pizza]

My advice is probably going to be taken as a grain of salt, as it should...but I never trust the details in advertisements on Alibaba/Aliexpress. I always get into contact directly with the vendor to confirm all the details before purchasing, then I typically only use Alibaba to handle the payment portion.

Most of the times you find listings from counterfeit or trading companies, which these listings are from a trading company, not the manufacturer. These BMS units are originally manufactured by Jaibaida, or JBD for short. If the company you are buying from is NOT Dongguan Jia Bai Da Electronic Technology Co., Ltd. then you are dealing with a trading company, not the manufacturer. Also do note that JBD only has one sales person that speaks English.

Best way to communicate to vendors is almost always through WeChat, but if you don't have WeChat already, I wish you luck because to create an account requires having a friend that has already had wechat for 6 months to verify you, and your friend can only verify 1 person per month.

I'm with @mikefitz on this one, overkill solar is the way to go if you are in the USA, but since we don't know and can't assume your location, it may not be an option. @MrNatural22 said that I will be stocking these soon, and that is true, I will be, but as of today, it will be at 14 days for manufacturing and at least another 14 days for shipping by air, at which point your order with OverkillSolar would likely have already been fulfilled.

The other catch about buying on Ali is that sometimes you get hit with an import duty along the way, which can come as a surprise and is no fun.

I've gotten hit with a surprise 22% duty on a $8.6k purchase before back when I was buying CALB CA180 cells. Trust me, I wised up quickly.

Would you have a link to the JBD store on aliexpress please?

 

[mikefitz]

Since you are in the UK try LTT Power Electronics for the unit. I have purchased several from this company, express air shipping takes 7 to 8 days to the UK shipped from Hong Kong. Payment option is via PayPal which is useful. Its a bit hit and miss with duty, about half the time there is a approximately £12 duty added.

Power output of the 120A unit seems OK, I tested at 100A for 2 hours with acceptable temperature rise (less than 10C).
The serial port drives the Bluetooth module on the 120A unit, from LTT there is an option to add a additional RS485 port at a small extra cost.

I have not purchased/used any of the higher powered units so cannot comment.

Solar controller disconnect from the battery does not seem to cause damage to most controllers, however this should rarely occur since the BMS is a last line of protection not for charge control.

In the UK the install will require a low temperature sensor, note the same sensor is used for high temp detection of the pack voltage and thus a protection and safety addition.

The balance option whilst only low current does work for minor cell imbalance. The problems occur when the cells are not top balanced correctly, or charging too close to 3.65 volts per cell, or poor quality mismatched cells.

Mike

 

[mystic pizza]

Since you are in the UK try LTT Power Electronics for the unit. I have purchased several from this company, express air shipping takes 7 to 8 days to the UK shipped from Hong Kong. Payment option is via PayPal which is useful. Its a bit hit and miss with duty, about half the time there is a approximately £12 duty added.

Power output of the 120A unit seems OK, I tested at 100A for 2 hours with acceptable temperature rise (less than 10C).
The serial port drives the Bluetooth module on the 120A unit, from LTT there is an option to add a additional RS485 port at a small extra cost.

I have not purchased/used any of the higher powered units so cannot comment.

Solar controller disconnect from the battery does not seem to cause damage to most controllers, however this should rarely occur since the BMS is a last line of protection not for charge control.

In the UK the install will require a low temperature sensor, note the same sensor is used for high temp detection of the pack voltage and thus a protection and safety addition.

The balance option whilst only low current does work for minor cell imbalance. The problems occur when the cells are not top balanced correctly, or charging too close to 3.65 volts per cell, or poor quality mismatched cells.

Mike

Thanks Mike. Did you mean LLT Power? Did you buy direct from their website, or through Aliexpress?

My power demands are modest, so I can't see it being driven anywhere near its full load.

As you can probably tell, I am new to all this, and this is my first experience with these types of cells.

Thank you.

 

[mikefitz]

Did you buy direct from their website,

Direct from TLL Power via the link I posted above. Paying with PayPay was an advantage for me, as was the short delivery time.

Mike

 

[Tecnodave]

1. Good point thanks. So approx 70 A of a 120A BMS. That should suit me fine, though I notice they have a 150 A version too,
2. Is the serial port UART/485 offering on the above BMS?
3. ?
4. I live in the UK, where it often falls below zero degrees C, so probably a good option to include low temp disconnect
5. Ah, now I hadn't even considered this. I have an Outback Flexmax 30 MPPT, which is a rebadged tracer BN series controller. I have no idea what happens if it is disconnected. I assume you mean from the battery.
6.Noted.

Many thanks

Tracers emit magic smoke when disconnected from load with power in from panels........been there, done that, MidNite Solar’s Kid controller also will be damaged by removing output while solar input is high.....did that one too.....disclosure...im on the MidNite Kid beta test group...push them as far as you can, lets see what happens!

 

[kite]

I'm also about to build my first couple batteries and will likely order JBD BMSs.

I like the idea of a screen that display pack voltage, cell voltage, and current. The SOC may be off but even if it's close that's nice. Not having to connect to bluetooth every time I want to check up on things is a plus for me.

Fidelia at JBD claims the BMS can be ordered with both UART and RS485 ports to allow simultaneous use of the bluetooth and touch screen. Has anyone done that? See any problems?

 

[BlitzSSS]

I'm also about to build my first couple batteries and will likely order JBD BMSs.

I like the idea of a screen that display pack voltage, cell voltage, and current. The SOC may be off but even if it's close that's nice. Not having to connect to bluetooth every time I want to check up on things is a plus for me.

Fidelia at JBD claims the BMS can be ordered with both UART and RS485 ports to allow simultaneous use of the bluetooth and touch screen. Has anyone done that? See any problems?

I have both a BT module and this touch screen connected via UART at the same time with a cable I soldered myself and it works. You can't have both the screen and a connection via BT used simultaneously but why would you do that?

When the screen is on the BT doesn't work, but the screen turns off automatically after a minute anyways and then BT works fine for anytime I want to check via the app because I'm not in front of the battery at the time.

 

[kite]

Yeah that's good enough for me, nice to know it works. I just don't want to have to open up the battery pack in my van to swap the connection between Bluetooth and screen. Thanks for the info.

 

[mikefitz]

The JBD BMS with both UART and RS485 available from LTT,

4S or 3S 12V Li ion or Lifepo4 Battery smart BMS with Bluetooth function UART and RS485 communication with 60A to 120A constant current – LLT POWER ELECTRONIC

Mike

 

[mystic pizza]

I bought the 150A version. Dispatched last week.